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Options
- Fe and Fe2O3
- Al and Al2O3
- Fe and Fe3O4
- Al and Al3O4
Explanation:
Here, the metal used in the thermite process is aluminium (Al). When aluminium is burned in air, it produces aluminium oxide (Al₂O₃), which is an amphoteric oxide.
So the correct option is (b) Al and Al₂O₃.
Here’s why the other options are incorrect:
- (a) Fe and Fe₂O₃: Iron (Fe) is not used in the thermite process. The thermite reaction uses aluminium and iron oxide (Fe₂O₃).
- (c) Fe and Fe₃O₄: As mentioned above, iron is not used in the thermite process.
- (d) Al and Al₃O₄: Aluminium oxide does not exist as Al₃O₄. The correct formula for aluminium oxide is Al₂O₃.
The thermite reaction is a highly exothermic reaction that produces a lot of heat.
It is used in welding, cutting, and demolition. The reaction is as follows:
2Al + Fe₂O₃ → Al₂O₃ + 2Fe + heat
In the reaction, aluminium is oxidized to aluminium oxide, and iron oxide is reduced to iron.
The heat released by the reaction is used to melt the iron, which can then be used to weld or cut metals.
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